Pivot door plate



I Jan. 10, 1939.

F. KUFNER 2,143,704

PIVOT DOOR PLATE Filed April 1, 1937 W W K I jzzrneys Patented Jan. 10, 1939 UNITED STATES PATENT OFFICE Application April 1, 1937,

Serial No. 134,222

In Czechoslovakia April 3, 1936 1 Claim. '(ol. 16166) The so-called pivot door plate (as shown and described for instance in the German patent specification No. 63,344) is known to be a hingeless door or window fitting. It comprises two juxtaposed pivots provided on the top and bottom of a door or window wing, one of the pivots which serves as a trunnion being guided in a slot of the frame extending in the direction of the closed position of the wing, while the other pivot upon opening of the wing moves through an arc in a guiding slot of the frame, the ends of the said last mentioned slot determining the extreme positions of the wing in closed and open positions. In the known constructions of pivot door plates the said guiding slot is formed as an arc arranged eccentrically with respect to the trunnion in the closing position of the latter and bent outwardly at its one end to form a part located in alignment with the slot for the trunnion. Upon completion of the closing rotation of the wing the guide pivot must be pushed into this part of the slot by a lateral movement of the said wing in order to prevent unintentional opening movement of the wing. Similarly it is necessary, before the beginning of each opening movement of the wing, to push the same laterally first in the opposite direction in order to free the guide pivot from the bent part of its respective slot and to bring it within the limits of the are shaped part of the said slot. This complicated wing movement requires, however, also a special formation of the closing edge of the wing and of the closing side of the frame.

An object of the prevent invention is to eliminate the disadvantages of the well known construction and to providea device in which a pair of hinge sections are operatively connected together by means of a pair of pins projecting from one hinge section and received by slots in the other hinge section, one pin forming the pivot for the hinge section being received by a short slot which is located longitudinally of the hinge section carrying the slot while the other pin is received by an elongated slot extending at an acute angle to the short slot, one end of the long slot being in alignment with the short slot while the other end of the long slot being located approximately at a right angle to the short slot, spring means being employed which constantly engages the pin in the short slot so that the said spring will tend to move the pin in the short slot always toward one end of the said slot, whereby the door or window will tend to move to its open position or closed position by the action of the spring and whereby it will be unnecessary to shift the door or window in a particular direction in order to remove one pin from a projecting portion of the slot as is necessary in the well known construction defined above.

With the present construction the pin or trunnion will automatically be returned to one end of the short slot after it has been moved to the opposite end of the slot at the completion of the movement of the other pin to the opposite end of the elongated slot.

In the drawing:

Figures 1 and 2 show in sectional and plan views, respectively, an embodiment of two hinge sections in multiple wing doors,

Figure 3 is a horizontal section showing a single hinge, and

Figure 4 shows more or less diagrammatically the movements of a hinge section as the door or Window is moved from its open to closed position.

Referring more particularly to the drawing, I designates a plate having elongated slots 2 which are inclined at an acute angle to short slots 3. The last-mentioned slots are disposed in parallel relation with the side edges of the plate I.

In the forms shown in Figs. 1 and 2 a single plate is provided with a pair of elongated slots 2 which have their upper ends extending in opposite directions from each other while the lower ends project towards each other and towards the central portion of the plate. A pair of plates 4 are adapted to lie in fiatcontact with the plate I and are provided with pins or trunnions 5 and 6 projecting laterally therefrom and received, respectively, in the slots 2 and 3.

Each of the pins or trunnions are provided with a rotatable sleeve I to facilitate ease of movement in the slots. These pins are secured to plates 4 by means of reduced portions which project through openings in the plates and the outer ends of the reduced portions are swaged over to secure the pins or trunnions to the plates 4.

plate in position.

The plates 4 are also provided with openings 8a to receive screws for fastening said plates in each side of the central portion and are adapted to engage the trunnions 6. Each spring at all times tends to maintain its respective trunnion in one end of the small slot 3 which is the initial or starting position of said trunnion. The spring g or dead center position returns the trunnion to this position after it has been moved towards the opposite end of the slot.

In Fig. 3 is shown a plate I having the slots 2 and 3 and this plate like the plate shown in Figs. 1 and 2 is adapted to be secured to the frame of the door or window while plates 4 are secured to the top and bottom of the door or window. Since the construction shown in Fig. 3 is substantially identical with that shown in Figs. 1 and 2 it will not be necessary to duplicate the description of the construction.

The operation of the following:

During the opening of the door the trunnion 6 is shifted in the slot 3 against the spring force, until the pin 5 has shifted oven-half the length of the-slot 2, when the trunnion 6 return under the influence concave seat at the same end of slot 3 occupied by the trunnion 6 in the closed position.- Thus the trunnion 6--movesthrough a complete cycle to andl-froeach. time the window is swung and the-spring Ill-acts to urge the window toward a closed and open position;, with an intermediate being occupied by the window and the swinging hingeleaf in which thespring is not effectivefor assisting in either opening orclosing.

The-dotted lines in hinge construction is the.

may again of spring-10 to the Fig. 4 show the angular.

positions that the plates take and likewise the swingable closure which may be a door or window. The dot and dash line in this figure indicates the path through which the outer end of the plates 4 passes or the path through which the vertical edge of the window or door passes.

The return-swinging of the door or window to its closed position is effected under the same relation of the trunnion .6 and pin 5, this latter being shifted only from the inner end of the slot 2 towards the second end of this slot which is in alignment with the slot 3.

So the door or window may start for its opening or closing directly from its position of rest, that is to say its closed or its opened position.

What I claim is:-

A hinge for a closure comprising a pair of plates in superimposed relation, one of the plates having a pivot slot extending longitudinally of the plate and a guide slot located at an angle to the pivot slot,--a guide pin on the other plate and projecting-into the guide slot, a trunnion also on the other plate'and received by the pivot slot, a spring tending. to maintain the trunnion at one end of the pivot slot in either the closed or open position ofthe closure, the ends of the guide slot in pin determining the cooperation with the guide extreme positions of the closure.

FRANTISEK KUFNER. 

